The present invention relates to mobile radios, and more particularly to mobile radios in which
Antennas are equipped to receive and transmit radio waves,
Exemplary mobile telephone terminals.
of the technical background
Technology related to mobile communications, the general
e.g. Applied to mobile phones has recently been growing rapidly
seen. In such mobile phones antennas are considered special
important, and in accordance
with the shrinking mobile devices, it is necessary that
the antennas are scaled down to fit in there.
DE-A-197 37 544 discloses a flat antenna in which the resonant
Elements and the base plate are connected together and not
are parallel to each other. EP-A-1 052 723 discloses a microstrip antenna construction,
the one radiator, a ground plate and at least one matching element
which is capacitively coupled to a ground level. EP-A-0
867,987 discloses an antenna for
wireless communication devices,
comprising an antenna plate acting as a radiator, a feed element
for feeding the spotlight and fasteners to the antenna
to attach to a wireless communication device, which is a
With reference to the attached
The drawing below is an exemplary antenna of a mobile
set up in a mobile telephone terminal.
8th 12 shows schematic front and cross-sectional side views of a mobile telephone terminal, eg a mobile radio set-up having established a conventional mobile radio antenna therein.
In 8th The conventional mobile phone terminal encloses a housing 101 , an ad 102 exemplified by a liquid crystal display, a key area 103 exemplified by a numeric ten-key block, a battery 104 , a built-in antenna 106 and a base plate 105 for electrical connection among these components. The built-in antenna 106 is through an antenna element 106a a planar configuration and two metal connections 106b and 106c structured. This type of built-in antenna 106 is generally referred to as a planar inverted-F antenna (PIFA). The antenna element 106a is at a predetermined voltage from a supply point 107 on the base plate 105 over the metal connection 106b provided. The antenna element 106a is over the metal connection 106c with the ground (GND) level on the base plate 105 connected. Here is the length of a perpendicular from the antenna element 106a to the base plate 105 ie, the distance therebetween, defined as an antenna height h 0 .
This antenna height h 0 substantially affects the characteristics of the built-in antenna 106 , including the resonance frequency and the frequency bandwidth, that is, the greater the height h 0 , the better the antenna characteristics. In addition to the height h 0 , the decisive factors for the antenna properties are the size of the antenna element 106a , the positional relationship between the metal terminals 106b and 106c and similar.
Nevertheless, the conventional mobile radio antenna structured as above has a problem that the larger height h 0 results in thicker mobile telephone terminals, therefore it fails to miniaturize.
On the other hand, in order to reduce the thickness of the mobile phone terminals, there is no choice but to reduce the antenna height h 0 . This is true because the ad 102 , a speaker and other components on the other side of the base plate 105 are placed, which the built-in antenna 106 has been arranged, can not be reduced in thickness for this purpose. With the smaller antenna height h 0, however, is the capacitive coupling between the antenna element 106a and the base plate 105 increased. This will result in a poor match and accordingly reduce the antenna characteristics.
It is an object of the present invention to provide a smaller format
in which their built-in antennas are high enough
to improve the antenna properties.
Task is accomplished by mobile radios,
having an antenna as set forth in the independent claims.
Further preferred embodiments
are the subject of the dependent
These and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken together taken with the attached drawings, will become more apparent.
BRIEF DESCRIPTION OF THE
1 Fig. 10 is a schematic diagram showing the structure of a mobile radio according to a first embodiment of the present invention;
2 and 3 Fig. 10 are schematic diagrams showing other structures of the mobile radio according to the first embodiment of the present invention;
4 Fig. 12 is a schematic diagram showing the structure of a mobile radio according to a second embodiment of the present invention;
5 and 6 Fig. 10 are schematic diagrams showing other structures of the mobile radio according to the second embodiment of the present invention;
7 Fig. 12 is a schematic diagram showing an exemplary case suitable for mobile radios according to the first and second embodiments of the present invention; and
8th Fig. 10 is a schematic diagram showing the structure of a conventional mobile radio.
THE PREFERRED EMBODIMENTS
of the present invention by reference to the accompanying drawings
1 schematically shows front and cross-sectional side views of a mobile radio according to a first embodiment of the present invention.
In 1 The mobile radio of the first embodiment includes a housing 11 , an ad 12 exemplified by a liquid crystal display, a key area 13 exemplified by a numeric ten-key block, a battery 14 , a built-in antenna 16 and a base plate 15 for electrical connection among these components. The built-in antenna 16 is through an antenna element 16a a planar configuration and two metal connections 16b and 16c structured. The antenna element 16a comes with a predefined voltage from a supply point 17 on the base plate 15 over the metal connection 16b provided. The antenna element 16a is over the metal connection 16c with a ground (GND) level of the base plate 15 connected. Here, the operation of the GND pattern of a circuit board as a base plate is quite possible. Also, any housing or substructure made of a conductive material can certainly be used as a base plate. Even if the housing or base is not conductive, covering it with a conductive material will work.
Here are fins, both from the upper and the lower end of the antenna element 16a , on the base plate 15 to precipitate. The length of the solder at the upper end is now referred to as an upper height h 1 , while the length at the lower end is referred to as the lower height h 2 . The antenna element 16a is so against the base plate 15 tended to satisfy h 1 greater than h 2 . Here it is important that the metal connections 16b and 16c are arranged so that they are longer than the lower height h 2 . That's why the metal connections are 16b and 16c on the upper side of the built-in antenna 16 to place, this is the upper part of the case 11 ,
With such a placement, the metal connection 16b from its connection part (supply part) on the antenna element 16a to the base plate 15 and the metal connection 16c from its connecting part (short-circuiting part) on the antenna element 16a to the base plate 15 higher than the lower height h 2 . This results in easier impedance matching, and therefore the antenna characteristics will be improved. By tilting the antenna element 16a against the base plate 15 As such, the lower height h 2 further increases the capacitive coupling between the antenna element 16a and the base plate 15 , This will reduce the resonant frequency of the antenna, thereby successfully downsizing the antenna.
In the case where the built-in antenna 16 As structured above, the rear part of the housing 11 shaped so that it according to the antenna element 16a is inclined, as in 1 shown. The rear part of the housing 11 looks so smooth while making sure that the lower height h 2 of the built-in antenna 16 is smaller. As a result, the mobile radio has a better appearance from the design point of view, and the user's hands do not cover the antenna part while holding the mobile radio.
Here can, rather than the built-in antenna 16 out 1 as above on the base plate 15 to install, the built-in antenna 16 before to the inside of the inclined part of the housing 11 be attached. 2 shows an example of the mobile radio in such a structure. Here in 2 is every ingredient that is identical to that 1 is provided with the same reference numerals.
The mobile radio off 2 is through a housing 21 and another housing with a built-in antenna attached thereto 26 structured (hereinafter antenna-enclosed housing 22 ). The built-in antenna 26 is composed of an antenna element 26a and two metal terminals, ie, a supply pin 26 and a shorting pin 26c , The antenna element 26a is fixed (fixed) to the inside of the antenna-containing housing 22 , To the antenna element 26a are the supply pin 26b and the shorting pin 26c electrically connected. If such a structured antenna-enclosed housing 22 with a housing 21 is the supply pin 26b electrically connected to the supply point 17 , and the short-circuiting pin 26c is with the mass surface of the base plate 15 connected.
With such a structure, wherein the built-in antenna in advance to the antenna-enclosed housing 22 attached, may be an adjustment of the distance between the antenna element 26a and the antenna-enclosed housing 22 to be executed with accuracy.
of the mobile radio
is generally made of dielectric material, and therefore varies
the resonant frequency of the antenna as a function of the positional relationship
between the case
and the antenna, i.e., the closer,
the lower the resonance frequency. Accordingly, with the
Construction in which the built-in antenna is fixed in advance to the housing
is stabilized, the resonance frequency of the antenna. As a
the antenna properties are also stabilized, and so on
the band properties are reduced in the span.
As another alternative structure, a shield between the built-in antenna 16 and the base plate 15 out 1 to be placed. 3 shows an example of the mobile radio with such a structure. Here in 3 is every component that is identical to the one out 1 is provided with the same reference numerals.
The mobile radio off 3 continue to close a shield 18 and an antenna support base 19 one. The antenna element 16a is via the antenna support base 19 at the shield 18 fixed on the base plate 15 is placed. Here it is assumed that the shielding 18 having a wireless circuit inside. The real purpose of placing the shield 18 is to protect the wireless circuitry contained therein from radio waves emitted by the antenna. In this case, the shield can 18 also lead to a simpler impedance matching of the antenna. This is because the capacitive coupling by adjusting the height of the shield 18 or the distance between the shield 18 and the antenna element 16a can be controlled. Next, the characteristics of the built-in antenna 16 by fixing the built-in antenna 16 with the help of the antenna support base 19 be stabilized. Continue with the antenna support base 19 Made of a dielectric material, the resonant frequency of the antenna can be lowered so that the antenna can certainly be downsized.
In the mobile radio apparatus of the present embodiment, the built-in antenna is 16 against the base plate 15 tilted so that the antenna height, ie the distance to the base plate 15 , at the upper end of the antenna is larger than at the lower part. This structure is not limiting and the upper end of the housing may be rounded from the design point of view, or the antenna element 16a may for example be provided with a conductive wall to the capacitive coupling to the base plate 15 to increase. Even in such cases, the same effects as above are certainly to be expected.
described above is according to the mobile
the first embodiment
the built - in antenna is tilted against the base plate so that the
Distance between the upper part to the lower decreases and the supply part
is placed at the top. With such a structure, the
Antenna properties can be improved by placing the supply part
at the top and the capacitive coupling due to the proximity between
the lower part of the antenna and the base plate, reducing the resonant frequency
the antenna is successfully lowered. Continue to cover from a design point of view
the user hands
the antenna part when holding the mobile radio is not, and the mobile radio has a
4 schematically shows a front and side cross-sectional view of a mobile radio according to a second embodiment of the present invention.
In 4 The mobile radio of the second embodiment includes a housing 31 , an ad 32 exemplified by a liquid crystal display, a key area 33 exemplified by a numeric ten-key block, a battery 34 , a built-in antenna 36 and a base plate 35 for electrical connection under these components. The built-in antenna 36 is through an antenna element 36a a planar configuration and two metal connections 36b and 36c structured. The antenna element 36a is at a predetermined voltage from a supply point 37 on the base plate 35 over the metal connection 36b provided. The antenna element 36a is at a ground (GND) level of the base plate 35 over the metal connection 36c connected.
The base plate 35 is structured by an antenna housing section, which influences the antenna properties, and by a circuit housing section, the rest of the base plate 35 is. Specifically, the antenna housing section includes, for example, a part (supply part) in which the metal terminal 36b with the antenna element 36a is connected, and a part (short-circuiting part), in which the metal connection 36c with the antenna element 36a connected is. In accordance with the desired antenna characteristics, the antenna housing section is positioned to the built-in antenna 36 high enough, that is, the distance between the base plate 35 and the antenna element 36a big enough to hold. The antenna housing section is thus in the direction of the front side of the housing 31 positioned. On the other hand, the circuit housing portion is toward the back of the housing 31 positioned to a space for viewing 32 and the key area 33 provided. By such structuring of the base plate 35 can the case 31 the ad 32 and the key area 33 record in it, without the height h 3 of the built-in antenna 36 to reduce. As a result, the housing can 31 successfully reduced in thickness.
Alternatively, here is the base plate 35 be structured by several base plates; some are for receiving the built-in antenna, and some are for receiving the circuit. 5 shows an example of the base plate having such a structure. Here in 5 is every ingredient that is identical to that 4 is provided with the same reference numerals.
In 5 is the base plate through an antenna housing base plate 38 and by a circuit base plate 39 structured. The antenna housing base plate 38 is composed of a base plate 38a , a side wall 38b and a connection 38c , The base plate 38a is with the connection 38c over the side wall 38b connected. The built-in antenna 36 is on the base plate 38a placed. To arrange the base plate of this type, first bring the built-in antenna 36 on the antenna housing base plate 38 and then connect the antenna housing base plate 38 to the circuit base plate 39 about the connection 38c , In such a way, the antenna part, ie the antenna housing base plate 38 plus the built-in antenna 36 , are manufactured separately, and so the productivity will be increased.
In the second embodiment, characteristically, the antenna case base plate becomes 38 and the circuit base plate 39 separated from each other and placed so that their surfaces are not aligned in the same plane. Here, by adjusting the distance between the side wall 38b and the antenna element 36a , the capacitive coupling are controlled accordingly, and this can lead to a simpler impedance matching. Here is the connection 38c simply to the circuit base plate 39 as long as an electrical connection is made between them.
Referring to 6 when the connection 38c the antenna housing base plate 38 and a conductive pattern 39a on the circuit base plate 39 Both are changed in shape, a gap may be 40 between the antenna housing base plate 38 and the circuit base plate 39 are formed when these are coupled to one another. In this case, if the gap 40 is designed to be ¼ λ (wavelength) in length w, the impedance becomes in consideration of the circuit base plate 39 maximum. Accordingly, the built-in antenna 36 irrelevant to the circuit base plate 39 be designed, and the built-in antenna 36 becomes more versatile, suitable for mass production. Referring to 6 the case is explained in which the gap 40 in length w and width d is adjusted by changing the shape of the connection 38c and conductive patterning 39a , Alternatively, the gap 40 be adjusted by using any other parameter.
In case of 6 even if the gap 40 between the antenna housing base plate 38 and the circuit base plate 39 is provided, this is not limiting. In the case that the base plate has no side wall 38b includes, like the base plate 15 In the first embodiment, there is no problem to provide a gap.
the features of the built-in antenna can be optimized by
Adapt, through the gap, the length
a current path. If this is the case, the number of slots is
not limited to 1. If e.g. provided a variety of slots
are, the base plate can be equivalent
in the dimensions
Even if the slots are provided in the base plate, where the power distribution
is high in such a way to cross the current path,
surely the base plate can be equivalent
be enlarged in their dimensions.
Here are the structures of the first and second embodiment certainly be combined together. With the resulting structure, the antenna can be set higher, so that the antenna characteristics can be improved.
described above is in the mobile radio of the second embodiment
the base plate through the antenna housing portion and the circuit housing portion
structured, and these sections are placed so that they do not
oriented in the same plane, for the purpose of making room for others
Provide components. With such a structure, the built-in
Antenna high enough, without increasing the thickness of the mobile radio, what
leads to a successful improvement of antenna properties.
in the first and second embodiments, cases are described
where the built-in antenna is a planar, inverted F-antenna
is, and this is not limiting.
What the first embodiment
is concerned, the same effect is certainly also by such
Tilting the built-in antenna reaches that part of the antenna,
where the power distribution highest
is, i. the part where the height
the antenna is intended higher
is set as the rest. The same effects can be achieved by
Structuring instead of tilting the built-in antenna in stages
be achieved. As for the second embodiment, the same
Effect can certainly be achieved by structuring the built-in
Antenna in such a way that the part of the antenna,
where the power distribution highest
is, i. the part where the height
the antenna is determined higher
is laid as the rest.
even if the mobile radios
the first and second embodiments
provided with an antenna, this is not limiting. The built-in
Antenna of the present invention is certainly associated with
used by an adjustable whip antenna, or more of the built-in
Antennas are used together. Even in such a case are
to achieve the same effects.
The present invention certainly covers a variety of frequency bands.
In the case of the common use of multiple antennas, these can
be structured so that they cover a variety of frequency bands.
If an antenna is used that is capable of a variety
of frequency bands
cover a short-circuiting part (or a supply part)
first resonant frequency band and a short-circuiting part (or supply part)
second resonant frequency band respectively at their antenna element so
the line for
Parts (or the power supply to the supply parts) selectively
is controlled. With such a structure, either the first
Resonant frequency band, or the second resonant frequency band are covered.
To cover these two resonant frequency bands simultaneously,
the antenna element can be provided with a slot, so that
the original one
Antenna element determines the first resonant frequency band and the
Slot part, the second resonant frequency band.
that will be partial or total
the gap between the built-in antenna and the base plate
reduce the built-in antenna with a dielectric material
and will also stabilize it on the base plate.
Last, as regards the mobile radio of the first and second embodiments, shows 7 an example of their housing designed to take off at some point in the distance for the users to place their fingers on it.
In 7 begins the width of the case 41 becomes narrower at the lower end of the antenna housing portion in terms of the antenna characteristics, and subsequently the area around it becomes the finger placement portion 41a designated. With the finger placement section 41a For example, the user may hold the lower part of the mobile radio, and thereby the antenna characteristics are prevented from deteriorating. Next, as the upper part of the case 41 remains wide, the width of the built-in antenna be wider. Especially for the mobile radio of the first embodiment, the size of the display can be enlarged ver. The resulting mobile radio will be considered as an information terminal as user-friendly.
it is certainly possible
to provide a plurality of finger placement sections and, if
the so is to arrange them so in the vertical direction that the
Users of holding the mobile radio is facilitated. In addition, like the
Users know which part of the mobile radio they are
wherein the antenna part is avoided.